Fire spread from an open‐doors electrical cabinet to neighboring targets in a confined and mechanically ventilated facility

Zavaleta, Pascal; Suard, Sylvain; Audouin, L.

doi:10.1002/fam.2685

Cited by 11 publications

(26 citation statements)

References 9 publications

(12 reference statements)

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“…For each fire test, HRR evaluations were thus carried out from the previous thermal and CDG calorimetry methods, and they are shown in Figure . Considering that the thermal method can underestimate the HRR by about 15% because of heat sinks not considered in the thermal method and that the CDG method can generally overestimate the HRR, as already highlighted in Zavaleta and Audouin and Zavaleta et al, the two evaluations above can be considered to be rather consistent. These considerations also lead to assess the final HRR (

\overset{Q}{true}

) as the average of the two previous HRR assessments:

\overset{Q}{true} = \frac{{\dot{Q}}_{thermal} + {\dot{Q}}_{CDG}}{2} .

…”

Section: Resultsmentioning

confidence: 81%

Cable tray fire tests with halogenated electric cables in a confined and mechanically ventilated facility

2019

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Summary Cable fires are one of the main fire hazards present in nuclear power plants (NPPs). Therefore, as part of the Organisation for Economic Co‐operation and Development (OECD) PRISME‐2 project, cable tray fire tests were performed both in open atmosphere conditions and in a confined and mechanically ventilated facility, called DIVA. These tests aim at showing the effects of a confined and ventilated environment on fire characteristics and consequences. This study deals with five fire tests, which used halogenated (poly [vinyl chloride] or PVC) cable types. Two tests were carried out in open atmosphere and three tests in the DIVA facility. The latter used a ventilation renewal rate (VRR) of either 4 or 15 h−1. The confined and ventilated conditions reduced the mass loss rate and heat release rate than did those obtained in open atmosphere. Furthermore, the three confined tests produced unburnt gases, which ignited in the fire room. Two explosions were highlighted for the tests that used a VRR of 4 h−1. These explosions indeed led to fast flame propagations over the entire upper part of the fire room and steep overpressures of almost 150 hPa. The low‐qualified PVC cables and the ventilation set‐up used in this study strongly contributed to the occurrence of these explosions.

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\overset{Q}{true}

) as the average of the two previous HRR assessments:

\overset{Q}{true} = \frac{{\dot{Q}}_{thermal} + {\dot{Q}}_{CDG}}{2} .

…”

Section: Resultsmentioning

confidence: 81%

Cable tray fire tests with halogenated electric cables in a confined and mechanically ventilated facility

2019

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“…According to their analysis, the CDG method was more appropriate. Only the CDG method was therefore applied for CORE‐5 test to evaluate the HRR as it was done in Zavaleta and Audouin …”

Section: Resultsmentioning

confidence: 99%

Experimental study of smoke effects on energized electrical cabinets located nearby a lubricant oil pool fire

Tasaka

Shirai

et al. 2019

Fire and Materials

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Summary This paper presents an experimental study of smoke exposure effects on potential malfunction of three electrical cabinets located nearby an oil pool fire. This study was performed as part of the PRISME‐2 international OECD project. Lubricant oil was used as fire source, and three real energized electrical cabinets were used as targets exposed to smoke in the adjacent room to the fire room. The main fire properties, as well as the fire consequences, such as gas temperatures and smoke concentrations in the rooms, and the cabinets are presented in detail. The heat release rate was thus assessed at around 500 kW for nearly all the fire duration, and maximum gas temperatures reached 300°C in the fire room, and 120°C in the adjacent room. Moreover, the maximum gas temperatures and soot mass concentrations inside the cabinets ranged from 90 to 120°C and from 0.3 to 1 g/m3, respectively. Nevertheless, continuous electrical monitoring of the three cabinets did not highlight malfunction. After the experiment, monitoring test of the cabinets was conducted to investigate the potential effects. The isolation resistance of electrical circuits on the most severe smoke exposed cabinet reduced during the monitoring test. It seemed the soot deposition have caused it.

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“…Huang et al [5]. The influence of other factors on fire characteristics and the spread of flame on the surface of electrical cables were investigated in scientific work of Zavaleta et al [6] and Sarazin et al [7]. Considerably less attention has been dedicated to researching the influence of an electrical cable slope (relative to the horizontal plane) on the flame out time and the spread of flame over the surface.…”

Section: Introductionmentioning

confidence: 99%

Impact of Selected Electrical Cables Slope on Flame Out Time and Flame Spread

Nečas

Martinka

Wachter

et al. 2019

Research Papers Faculty of Materials Science and Technology Slovak University of Technology

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The aim of the research described in this paper was to study the impact of the electrical cables slope on the flame out time and the flame spread rate. Measured cables were thermally loaded by methanol flame (diameter of the container was 106 mm) at seven different slopes with respect to the horizontal plane (the slopes were 0° – horizontal orientation, 15°, 30°, 45°, 60°, 75° and 90° - vertical orientation). The first tested electrical cable was a copper three-core power one resistant to the flame spread with circuit integrity of the cable system during 30 minutes under fire (cross-section of each core was 1.5 mm2). The second tested electrical cable was a copper two-core signal one resistant to the flame spread with circuit integrity of the cable system during 30 minutes under fire (cross-section of each core was 0.5 mm2). The first electrical cable did not show reaction to fire class. The reaction to fire class of the second tested cable was B2ca, s1, d1, a1. The obtained results proved that slope had virtually no impact on the flame out time and the flame spread over the tested cable surface (tested cables of all slopes stopped burning after 1 to 5 seconds after methanol flame burned out). Likewise, the flame spread was only negligibly beyond the border of flame action for each cable slope.

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Fire spread from an open‐doors electrical cabinet to neighboring targets in a confined and mechanically ventilated facility

Cited by 11 publications

References 9 publications

Cable tray fire tests with halogenated electric cables in a confined and mechanically ventilated facility

Cable tray fire tests with halogenated electric cables in a confined and mechanically ventilated facility

Experimental study of smoke effects on energized electrical cabinets located nearby a lubricant oil pool fire

Impact of Selected Electrical Cables Slope on Flame Out Time and Flame Spread

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